Neofetch
What is it?
Neofetch is a command-line system information tool written in bash 3.2+. Neofetch displays information about your operating system, software and hardware in an aesthetic and visually pleasing way.
The overall purpose of Neofetch is to be used in screen-shots of your system. Neofetch shows the information other people want to see. There are other tools available for proper system statistic/diagnostics.
Installation
Full installation documentation can be found here, if you're using homebrew installation is as simple as:
$ brew install neofetch
Official documentation
Official documentation for neofetch can be found here.